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Three New Species of Tellina (Bivalvia, Tellinidae) from the Panamic Province

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Three New Species of Tellina (Bivalvia, Tellinidae) from the Panamic Province Zootaxa 2715: 55–58 (2010) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ Correspondence ZOOTAXA Copyright © 2010 · Magnolia Press ISSN 1175-5334 (online edition) Three new species of Tellina (Bivalvia, Tellinidae) from the Panamic Province EUGENE V. COAN1 & PAUL VALENTICH-SCOTT2 Santa Barbara Museum of Natural History, 2559 Puesta del Sol Road, Santa Barbara, California 93105, USA. E-mail: [email protected]; [email protected] In preparing a manual on the marine bivalves of the Panamic Province, we have found three species of the Tellinidae that lack names. The purpose of this paper is to describe a new species of Tellina (Hertellina), a new species of Tellina (Merisca), and a new species of Tellina (Acorylus). The subgenus Acorylus is reported for the first time from the eastern Pacific Ocean. Abbreviations: BMNH—The Natural History Museum, London; CAS—California Academy of Sciences, San Francisco, California; LACM—Natural History Museum of Los Angeles County, Los Angeles, California; SBMNH—Santa Barbara Museum of Natural History, Santa Barbara, California; UMML—University of Miami Marine Laboratory, Miami, Florida; USNM—United States National Museum of Natural History, Washington, D.C. Genus Tellina Linnaeus, 1758 Tellina Linnaeus, 1758. Type species (subsequent designation of Children, 1823): Tellina radiata Linnaeus, 1758. Recent, Caribbean. Shell elongate, compressed; hinge plate with two cardinal teeth in each valve and lateral teeth in one or both valves, sometimes overgrown in adults; often brightly colored and elegantly sculptured. Subgenus Hertellina Olsson, 1961 Hertellina Olsson, 1961. Type species (original designation): Tellina nicoyana Hertlein & Strong, 1949 Shell ovate elongate, thin shelled; sculpture of commarginal striae that become oblique toward posterior end; lateral teeth prominent in right valve; pallial sinuses not approaching anterior adductor muscle scars. Tellina (Hertellina) sadeghianae Coan & Valentich-Scott, new species Figures 1 A–E, 2 A Shell ovate-elongate, moderately inflated; subequilateral; exterior color light to dark pink; periostracum adherent, thin, shiny, slightly iridescent; umbonal region smooth; sculpture of commarginal striae that become slightly oblique near posterior end; posterior slope smooth, with only fine commarginal striae; right valve anterior lateral tooth short, thin, moderately close to cardinals; posterior lateral tooth thin, very distant from cardinals; pallial sinuses long, not reaching anterior adductor scars, mostly confluent with pallial line. Type material. SBMNH 352864, holotype; length, 24.5 mm; height, 14.3 mm. SBMNH 352864, 3 paratypes, paired valves; USNM 1146209, 1 paratype, paired valves. Type locality. Bahía Parita, Coclé, Panamá; 81°5’47”N, 80°16’35”W; 11–17 m, in sandy mud. Distribution. Bahía Ballena, Puntarenas, Costa Rica (9.7°N) [CAS], to Esmeraldas, Esmeraldas, Ecuador (1.0°N) [UMML, SBMNH]; 11–17 m [SBMNH]; sandy mud. Etymology. This species is named after Patricia Sadeghian of the Santa Barbara Museum of Natural History, who has taken thousands of bivalve images for our research projects and monographs. Comparisons. The only other Recent species in the subgenus, Tellina (Hertellina) nicoyana Hertlein & Strong, 1949, differs from T. (H.) sadeghianae in having a posterodorsal flange, widely spaced commarginal ribs on the umbonal region, being lighter in color, and in being more compressed (Figures 1 F–H). Sanguinolaria (Sanguinolaria) azulensis Olsson, 1942 (p. 194, pl. 18, fig. 8), described from the Pliocene Charco Azul Formation of the Burica Peninsula on the Costa Rica and Panama border, seems to be a synonym of T. nicoyana. “Sanguinolaria panamensis Dall ms” was listed by Bernard (1983: 43) as a synonym of T. nicoyana, presumably having been spotted on a label in the USNM. The new species differs from the Late Pliocene of Trinidad T. (H.) oligoscissulata Jung, 1969 (pp. 386–387, pl. 33, figs. 1–4), in being slightly more elongate, less high, and with a deeper pallial sinus that is more dorsally directed. Accepted by R. Bieler: 9 Nov. 2010; published: 7 Dec. 2010 55 Subgenus Acorylus Olsson & Harbison, 1953 Acorylus Olsson & Harbison, 1953. Type species (original designation): Tellina (Moerella) suberis Dall, 1900. Late Pliocene, Florida. Shell small, solid, convex, subovate, with small posterior flexure; two strong lateral teeth equidistant from cardinal teeth; pallial sinus large, deep, reaching to anterior adductor muscle scar and widely confluent with pallial line. Tellina (Acorylus) rickettsi Coan & Valentich-Scott, new species Figures 1 I–L, 2 B Shell ovate; inequilateral, much longer anteriorly (anterior end about 70% of length); posterior slope set off by weak sulcus in each valve; posterior end rounded; lunule shallow, elongate; escutcheon shallow, narrow; sculpture of dense, flat commarginal ribs that become lamellate and less dense posteriorly; commarginal ribs overlain by faint radial striae; right valve with very strong anterior lateral tooth and narrower posterior lateral tooth, the anterior tooth closer to cardinal teeth; pallial sinus merging with ventral edge of anterior adductor muscle scar in both valves. Length to 12 mm [SBMNH]. Type material. SBMNH 149544, holotype; length, 11.5 mm; height, 8.5 mm. SBMNH 149593, 4 paratypes, paired valves; UNSM 1146208, 1 paratype, paired valves; CAS 184230, 1 paratype, paired valves; LACM 3138, 1 paratype, paired valves. Type locality. Bahía San Carlos, Sonora, México; 27°56’05”N, 111°03’23”W; 15–30 m. Distribution. Isla Danzante, Baja California Sur (25.8°N) [SBMNH], and Bahía San Carlos, Sonora (27.9°N) [SBMNH], México, to Isla Rancheria, Golfo de Chiriquí, Panamá (7.6°N) [SBMNH]; 9–60 m [SBMNH]. Etymology. Named after Ed Ricketts, preeminent 20th century marine biologist of California and Mexico. Comparisons. The western Atlantic T. (A.) gouldii Hanley, 1846, differs in being more inflated, heavier, in having a still shorter posterior end and less prominent sculpture, and a shinier periostracum. It is well figured in Mikkelsen & Bieler (2007: 338–339). Subgenus Merisca Dall, 1900 Merisca Dall, 1900. Type species (original designation): Tellina crystallina Spengler, 1798. Recent, western Atlantic. Serratina Pallary, 1922. Type species (original designation): Tellina serrata Brocchi, 1814. Miocene, France. Shell ovate to ovate-trigonal; color white to cream internally and externally; with weak to strong posterior flexure; sculpture predominantly commarginal; escutcheon shallow to deep; pallial sinus extending to or slightly to moderately short of anterior adductor muscle scar. This subgenus was treated in detail by Boss (1966: 260–270). Tellina (Merisca) steinbecki Coan & Valentich-Scott, new species Figures 1 M–P, 2 C Shell ovate-subtrigonal, inequilateral, longer anteriorly (anterior end about 67% of length); posterior slope set off by moderate sulcus in right valve and shallower sulcus in left valve; posterior end not produced, moderately flexed to right, truncate; escutcheon deep, long, narrow; sculpture of dense, irregular commarginal lamellae, with conspicuous radial ribs in larger specimens that make the commarginal lamellae frilly in some places; right valve with very strong anterior and posterior lateral teeth, both distant and equidistant from the cardinal teeth; pallial sinus deep but stopping well short of anterior adductor muscle scar, merged with pallial line for about 70% of length. Length to 26 mm [CAS]. Type material. SBMNH 149550, holotype; length, 20.5 mm; height, 14.5 mm; SBMNH 149592, 56 paratypes, including both paired valves and separate valves; UNSM 1146207, 1 paratypes, 1 set of paired valves and 2 separate valves; CAS 184229, paratypes, 1 set of paired and two 2 separate valves; LACM 3137, paratypes, 2 separate valves. Type locality. Off the northeast end of Isla Danzante, Baja California, México; 25°48’15”N, 111°14’57”W; 200–300 feet [61–91 m]. Etymology. This species is named after John Steinbeck, noted American author who explored the Gulf of California with Ed Ricketts. Distribution. Bahía Santa Inés, Baja California Sur (27.0°N) [CAS], and Bahía San Carlos, Sonora (27.9°N) [SBMNH], México, to the Golfo de Cupica, Chocó, Colombia (6.4°N) [UMML]; Isla Baltra, Islas Galápagos, Ecuador (0.4°S) [CAS]; 35– 180 m. Comparisons. Tellina steinbecki has a pallial line similar to that of the Caribbean T. juttingae (Regteren Altena, 1965), but that species has a flaring, broadly rounded anterior margin, and has fine commarginal intercalary striae, rather than radial ribs. Of eastern Pacific taxa, it is closest to T. (M.) brevirostris Deshayes, 1855, but in that species the pallial sinus reaches very close to or fuses with anterior adductor muscle scars in both valves, with no area where sinus parallels pallial line (Figures 1Q–T). Tellina brevirostris is also more equilateral, the anterior end representing about 60% of the shell length, and the intercalary spaces between the commarginal lamellae have commarginal striae rather than radial ribs. 56 · Zootaxa 2715 © 2010 Magnolia Press COAN & VALENTICH-SCOTT FIGURE 1. A–E. Tellina sadeghianae new species, holotype (SBMNH 83582) length = 24.5 mm. A. Exterior of left valve. B. Interior of right valve. C. Interior of left valve. D. Hinge of right valve. E. Hinge of left valve. F–H. Tellina nicoyana Hertlein & Strong, 1949, holotype (CAS 31190), length = 34.5 mm. F. Exterior of left valve. G. Interior of right valve. H. Interior of left valve. I–L. Tellina rickettsi new species, holotype (SBMNH 149544)
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